This indicates an attack attempt against a remote Denial of Service vulnerability in Linux kernel.
The vulnerability is caused due to an error when IGMP processes a malformed packet. An attacker can exploit this by sending a specially crafted packet. Successful attacks may allow an attack to cause a denial-of-service condition on the affected systems.
All systems running Linux 2.6.36 or later (up to the 3.0.17, 3.1.9, 3.2.1, and the Debian package version 3.1.8-2)
Denial of Service: Remote attackers can crash vulnerable systems.
Apply patch available from the website.